Geographic Information Systems (GIS)

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Geographic Information Systems (GIS)

• Connecting People with the World Around Them

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An Information System

• Remember those overlay maps of the human body
  from grade school?

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A Geographic Information System

• A GIS is similar, layering mapped information in
  a computer to help us view our world as a system

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What is GIS?

• A Geographic Information System is a collection
  of tools to build, maintain, and use electronic
  maps and associated databases

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What Does GIS Do?

• It locates
• Physical infrastructure, like water and sewer
  pipes

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What Does GIS Do?

• It locates
• Areas, like land use

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What Does GIS Do?

• It locates
• Incidents, like crime statistics

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What Does GIS Do?

• It locates
• Quantities or densities, like disease mortality
  rates

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What Does GIS Do?
It identifies
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From Maps to Information
More than just maps In a GIS, the maps have
tables of data behind them.
This means when you combine different maps you
combine data to get the information you need.
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What Does GIS Do?

• It allows questions to be asked from the map side
  or from the database side

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What Does GIS Do?

• It allows questions to be framed geographically

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What Does GIS Do?

• It organizes a wide variety of spatial
  information types
• CAD data
• GIS data
• Pictures
• Video
• Audio

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GIS Can Answer Questions

• Identify all land parcels between 5 and 10 acres
  within 1 mile of interstate access with developed
  utilities.
• Highlight all CRP pipes greater than 24 in
  diameter installed before 1965.
• List names and phone numbers of all owners of
  property within 150 feet of the center of Oak
  Street between 10th and 14th Streets. List in
  descending order of property value.
• Find county bridge number 75 and play the
  inspection video that shows its defects.

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How Does GIS Provide Benefit?

• GIS improves efficiency
• GIS identifies opportunities
• GIS improves decisions by providing needed tools
  and data

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THANK YOU